+3.3V, ±15kV ESD-Protected, Fail-Safe, Hot-Swap, RS-485/RS-422 Transceivers

±15kV ESD-Protected, +3.3V, Fail-Safe, Hot-Swap, RS-485/RS-422 Transceivers

Please check latest availability status for a specific part variant.


The MAX3070E–MAX3079E 3.3V, ±15kV ESD-protected, RS-485/RS-422 transceivers feature one driver and one receiver. These devices include fail-safe circuitry, guaranteeing a logic-high receiver output when receiver inputs are open or shorted. The receiver outputs a logic high if all transmitters on a terminated bus are disabled (high impedance). The MAX3070E–MAX3079E include a hot-swap capability to eliminate false transitions on the bus during power-up or hot insertion.

The MAX3070E/MAX3071E/MAX3072E feature reduced slew-rate drivers that minimize EMI and reduce reflections caused by improperly terminated cables, allowing error-free data transmission up to 250kbps. The MAX3073E/MAX3074E/MAX3075E also feature slew-rate-limited drivers but allow transmit speeds up to 500kbps. The MAX3076E/MAX3077E/MAX3078E driver slew rates are not limited, making transmit speeds up to 16Mbps possible. The MAX3079E slew rate is pin selectable for 250kbps, 500kbps, and 16Mbps.

The MAX3072E/MAX3075E/MAX3078E are intended for half-duplex communications, and the MAX3070E/MAX3071E/MAX3073E/MAX3074E/MAX3076E/MAX3077E are intended for full-duplex communications. The MAX3079E is selectable for half-duplex or full-duplex operation. It also features independently programmable receiver and transmitter output phase through separate pins.

The MAX3070E-MAX3079E transceivers draw 800µA of supply current when unloaded or when fully loaded with the drivers disabled. All devices have a 1/8-unit load receiver input impedance, allowing up to 256 transceivers on the bus.

MAX3070E, MAX3071E, MAX3072E, MAX3073E, MAX3074E, MAX3075E, MAX3076E, MAX3077E, MAX3078E, MAX3079E: Pin Configurations and Typical Operating Circuits MAX3070E, MAX3071E, MAX3072E, MAX3073E, MAX3074E, MAX3075E, MAX3076E, MAX3077E, MAX3078E, MAX3079E: Pin Configurations and Typical Operating Circuits Enlarge+

Key Features

  • Protection for Robust Performance
    • ±15kV Human Body Model ESD on I/O Pins
    • True Fail-Safe Receiver While Maintaining EIA/TIA-485 Compatibility
    • Enhanced Slew-Rate-Limiting Facilitates Error-Free Data Transmission (MAX3070E-MAX3075E/MAX3079E)
    • Hot-Swap Input Structure on DE and Active-Low RE
  • Flexible Feature Set for Ease of Design
    • Pin-Selectable Full/Half-Duplex Operation (MAX3079E)
    • Phase Controls to Correct for Twisted-Pair Reversal (MAX3079E)
    • Allows up to 256 Transceivers on the Bus
    • Available in Industry-Standard SO and DIP packages
  • 10µA Shutdown Current Mode for Power Savings (Except MAX3071E/MAX3074E/MAX3077E)


  • Industrial Control
  • Instrumentation
  • Lighting Systems
  • Security Systems
  • Telecom
Part NumberTx/RxDuplexVSUPPLY
Data Rate
ESD Protect.
Tx ENRx ENICC (Shutdn.)
Rx/Tx on BusRx Failsafe w/ InputsSlew Rate LimitingOper. Temp.
typmintypSee Notes
MAX3070E 1Tx + 1RxFull3.30.825015YesYes0.05256Open or ShortedNo
-40 to +85
-40 to +125
SOIC (N)/14
$2.94 @1k
MAX3071E Full250NoNo-
SOIC (N)/8
$2.94 @1k
MAX3072E Half250YesYes0.05
SOIC (N)/8
$2.94 @1k
MAX3073E Full500YesYes0.05
SOIC (N)/14
$2.94 @1k
MAX3074E Full500NoNo-
SOIC (N)/8
$2.94 @1k
MAX3075E Half500YesYes0.05
SOIC (N)/8
$2.94 @1k
MAX3076E Full16000YesYes0.05
SOIC (N)/14
$3.14 @1k
MAX3077E Full16000NoNo-
SOIC (N)/8
$2.86 @1k
MAX3078E Half16000YesYes0.05
SOIC (N)/8
$2.94 @1k
MAX3079E Half/Full16000YesYes0.05
SOIC (N)/14
$2.94 @1k
See All RS-485/RS-422 Line Driver/Receivers (205)
Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.

Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C  

Note : The failure rates are summarized by technology and mapped to the associated material part numbers. The failure rates are highly dependent on the number of units tested.

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